Furnace for the manufacture of carbon



(U0 Model.) 2 Sheets-Sheet 1'. H. FRASGH. Y FURNACE FOR THE MANUFACTUREOF CARBON. 310,281,046. Patented July 10 1883;

WITNESSES 11v ml 10/? N, PUEWS. Phmoump n hu. Washington. D. c.

Nd Model.) 2 Sheets-"Sheet 2.

H. PRASGH.

FURNACE IEOR'THE MANUFACTURE OF CARBON.

No. 281,046. Patented July 10, 1883.

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UNITED STATES PAIENT @rricn.

HERMAN FRASOH, OF CLEVELAND, OHIO.

FURNACE FOR THE MANUFACTURE OF CARBON.

SPECIFICATION forming part of Letters Patent No. 281,046, dated July 10,1853.

Application filed January 12, 1883. (No model.)

To all; whom it may concern/.-

Be it known that I, HERMAN FRASOH, of Cleveland, in the county ofGuyahoga and State of Ohio, have invented certain new and useful 7Improvements in Furnaces for the Manufacture of Carbon; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains IO to make and use the same.

My invent'on relates to furnaces for the manufacture of carbon forelectric-light carbons and other purposes.

In the accompanying drawings, Figure 1 is a view in front elevation.Fig. 2 is a plan view. Fig. 3 is a transverse section, and Fig. i is avertical longitudinal section.

A represents the ash-pit, and B the fire-box door. The ash-pitcommunicates with two fines, O C, which extend to the rear end of thefurnace and then back and forth, forming return-fines, and having theirexit in the escapeilues D1) at the front of the furnace, where theymergeinto the stack or chimney E. The hearth of the furnace is constructed ofthe tilings a, which are placed directly over the dues C 0.

Upon the tilings a is placed a layer of asbestus, b, and upon the latterare placed the 0 tilings c, which are laid to break joints with thelower tilings, a. The arch F is covered with sand (I, and the wallsstrengthened by the tie-rods e. At the front of the furnace is locatedthe charging-opening G, provided with 5 a door, G. This door is locateda suflicicnt distance above the hearth or floor of the fur- I nace toallow of the proper charging of the furnace.

At the sides and end of the furnace are the +0 doors H, which are placedon a level with the hearth or floor for the removal of the carbon. Anescape pipe, I, communicates with the upper portion ofthe"furnace-chamber, and is provided with a stop-cock or valve, 2'. Apipe, 5 J, connects with the pipe I and leads beneath the grate of thefire-box. Pipe J is provided with a stopcock or valve, 9'. The lower endof the chimney or stack is provided with a damper, K.

Having described the construction and relative arrangements of myimproved furnace, I

an improvement in will now describe its operation: I take distilledhydrocarbon of high density, obtained by the distillation of petroleumor other hydrocarbon oils, and mix the same withs rfl fifiric'fig-or-nicricacid. After the furnace has been heated, all of the doorsbeing closed, the charging-door is opened, and the compound is chargedinto the furnace to the proper depth. i 'When the temperature reachesabout 300 605 Fahrenheit, the mass being quite liquid, reac- ,tionbegins to take place the hydrogen of the hydrocarbon combining with theoxygen of the acid if sulphuric acid is used, or steam and nitrogenouscompounds when nitric acid is used. This reaction tends to stiffen thewhole mass, so that it becomes quite hard even before the temperature of500 Fahrenheit is reached. By continuing the operation and graduallyincreasing the temperature to, say, 1000 Fahrenheit, or more, all of thedecomposition products, being volatile, are driven off, leaving acarboncokeupofi tlfdhearth of tlgniurnace almost chemically ure, quite louseand dry, and easily'remov'ed, which is effected by opening the sidedoors and inserting a slice-bar beneath the mass, breaking it up intopieces and removing them through the side doors. In charging the furnacethe damper K is opened to conduct the cscapiu g flame into the chimney,and thus not interfere with the workmen. The gases generated in the funnace may be allowed to escape, or be conducted to the ash-pit andburned. The quantity obtained by the process described is a largepercentage of the carbon originally employed. The sludge oils and acidcompounds which are drawn oif in the ordinary treatment of petroleumdistillates may be subjected to the same treatment, in which case thesame reaction takes place and the same carbon product obtained, therebyvery profitably utilizing what have been heretofore regarded as thewaste products of an oil-refinery. The furnace is constructed so thatthe heat will evenly be 95 distributed beneath the hearth, and thelatter is made comparatively thin so that the heat may readily betransmitted to the charge. By means of the two layers of tiling arrangedto break joints and the intervening layer or packing of asbestus aperfectly-tight hearth or floor is insured.

I make no claim in this application to the process described, as suchsubject-matter is de- 2. In a furnace for the manufacture of cal bon,the flooror hearth consisting of the layers of tiling and theintervening packing of asbestus, substantially as set forth.

' 3. Afurnacefor the manufacture of carbon,

having .a hearth or floor constructed of two layers of tiling, arrangedto break joints, and an intervening packing of asbestus, substantiallyas set forth.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

HERMAN FRASCH.

Witnesses:

F. O. MOGLEARY, GEORGE 000K.

